---
id: CVE-2026-86419
title: >-
  Affected versions of MISP contain insufficient validation of server-side
  outbound HTTP destinations in feed retrieval and TAXII discovery
  functionality.



  In feed processing, redirects were followed without validating the redirect
  scheme…
summary: >-
  Affected versions of MISP contain insufficient validation of server-side
  outbound HTTP destinations in feed retrieval and TAXII discovery
  functionality.



  In feed processing, redirects were followed without validating the redirect
  scheme…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H'
cwe:
  - CWE-200
  - CWE-918
vendor: misp-project
product: misp
affected:
  - misp <= 2.5.45
published: '2026-09-07'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T15:25:49.733'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86419'
references:
  - url: 'https://github.com/MISP/MISP/commit/06f541dcf'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
  - url: 'https://github.com/MISP/MISP/commit/08d6efe24'
    label: 5a6e4751-2f3f-4070-9419-94fb35b644e8
tags:
  - nvd
  - cve.org
  - score-dispute
epss: 0.00416
epssPercentile: 0.33383
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T14:51:03.740579Z'
scores:
  nvd: 9.1
  cna: 7
ingestedAt: '2026-09-08T15:33:26.977Z'
---

## Overview

Affected versions of MISP contain insufficient validation of server-side outbound HTTP destinations in feed retrieval and TAXII discovery functionality.


In feed processing, redirects were followed without validating the redirect scheme or destination. The original request headers were reused across redirect hops, meaning authentication headers or API credentials configured for a feed could be forwarded to a different host. Redirects could also target internal network resources, resulting in SSRF. The fix adds redirect validation, blocks internal destinations for cross-host redirects, strips configured feed credentials before following redirects to another host, and pins validated DNS results to prevent re-resolution after validation.


The TAXII discovery endpoint had a related incomplete SSRF defense. It used gethostbyname() and compared the result against only a few literal addresses. This missed cases including IPv6 loopback (::1), numeric host encodings such as 0x7f000001, and potentially multiple DNS records. The fix moves TAXII discovery to the shared URL egress validator.


Together, these commits harden MISP's outbound URL handling against alternate-address representations, DNS-related bypasses, unsafe redirects, internal-host access, and cross-host credential forwarding.






Version affected: ≤2.5.45

## Affected

- `misp <= 2.5.45`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.